Dell S3100 EMC Command Line Reference Guide for the Series 9.14.2.4 - Page 436

Version 7.8.1.0 7.7.1.0 Description Introduced on the S-Series. Introduced on the C-Series. Usage Information To determine a BGP session flap, both a route-down event and a subsequent route-up event corresponding to a single route are considered. As a result, a flap event is penalized only one time during the route-down event. The subsequent route-up event corresponding to the same route is not considered as a flap and is not penalized. The history paths that the show ip bgp command displays contain only the prefix and the next-hop information. The next-hop information shows the ip address of the neighbor. It does not show the actual next-hop details. The following describes the show ip bgp damp command shown in the following example. Field Description Network From Reuse Path Displays the network ID to which the route is dampened. Displays the IP address of the neighbor advertising the dampened route. Displays the hour:minutes:seconds until the dampened route is available. Lists all the ASs the dampened route passed through to reach the destination network. Example DellEMC# show ip bgp dampened-paths BGP local RIB : Routes to be Added 0, Replaced 0, Withdrawn 0 BGP local router ID is 192.168.11.5 Status codes: s suppressed, S stale, d dampened, h history, * valid, > best Path source: I - internal, a - aggregate, c - confed-external, r redistributed n - network, D - denied, S - stale Origin codes: i - IGP, e - EGP, ? - incomplete Network From Reuse Path d 55.0.0.0/24 172.16.0.2 00:36:23 200 DellEMC# BGP Extended Communities (RFC 4360) BGP Extended Communities, as defined in RFC 4360, is an optional transitive BGP attribute. BGP Extended Communities provides two major advantages over Standard Communities: • The range is extended from 4-octet (AA:NN) to 8-octet (Type:Value) to provide enough number communities. • Communities are structured using a new "Type" field (1 or 2-octets), allowing you to provide granular control/filter routing information based on the type of extended communities. set extcommunity rt To set Route Origin community attributes in Route Map, use this feature. Syntax Parameters set extcommunity rt {as4 ASN4:NN [non-trans] | ASN:NNNN [non-trans] | IPADDR:NN [non-trans]} [additive] To delete the Route Origin community, use the no set extcommunity command. as4 ASN4:NN ASN:NNNN Enter the keyword as4 then the 4-octet AS specific extended community number in the format ASN4:NN (4-byte AS number:2-byte community value). Enter the 2-octet AS specific extended community number in the format ASN:NNNN (2byte AS number:4-byte community value). 436 Border Gateway Protocol